Reamer.



PATENTED JAN. a, 1907.

Fig. 2,

M. Boop.

BEAMER.

APPLICATION FILED JUNE 1.5, 1906.

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tion n the line B B of Fig. 1.

MICHAEL Boor, 0F sTRAssBURG, GERMANY.

i REAMER. i

Specification of Letters Patent.

Patented Jan. 8, 1907.

Application tiled J-une 15,'1906. Serial N o. 321,813.

To all whom it may concern.-

Be it known that I, MICHAEL Boor, a subject of the German Emperor, residing at Strassburg, Alsace, Germany, have invented certain new and useful Improvements in Reamers, of which the following is a specification.

The subject of my invention is an improved reamer for deep boring of such construction that it can be raised Within the working barrel.

The advantage of the new tool over prior boring-heads is that when it isnecessary to remove the core the working barrel does not have to be raised, as the tool can be lifted with the core Witllin the barrel. The construction is such that on the bit striking the bottom of the bore-hole the boring-head is automatically coupled with the rotary barrel, while on raising the head again the parts are automatically uncoupled.

One form of reamer constructed according to this invention is illustrated in the accompanying drawings.

Figure 1 is a fragmentary view showing an elevation and part section of the new reamer in working position. Fig. 2 is a sec tion on the line A A of Fig. 1. Fig. 3 is a sec- Fig. 4 is a fragmentary sectional View showmg the parts at the bottom of the bore-hole when undercutting the core.

The crown-bit consists of two yoke-sha ed members a a, pivoted to the boring-head at c c. In the yokes a segmental blocks d, set with diamonds e, are secured. The outer diamonds roject beyond the circumference of the wor ring barrel and conduct-orf, while the innerv diamonds protrude into the interior of the head b. tating barrel f being readily advanced during work and provides am le space Within the head b for the core g. Wlien thel boring-tool is being drolliped into the barrel f, the yokes a occu y t 1e position shown in Fig. 4.

hen, owever, thebit strikes the bottom of the bore-hole, the yokes spread and take up the position shown in Fig. 1, the segments d lylng close against the bottom rim of the head b.

This admits of the rota- When a core g has been bored, the head b is slowly raised and the barrel f at the same time slowly sunk, the boring motion being c011- tinued. The yokes a will now turn on their pivots so that the bit will undercut the core g to a great extent. When the yokes a reachjthe position shown in Fig. 4, they lie free of the barrel f, and on further liftin of the head b the core g will be readily breien off and can be drawn up with the boringtool inside the barrel.

The rot-arybarrelf is provided-with rooves h at the bottom, and the cap kof the cringhead b is furnished with spring-actuated catches fi. Vhen the crown-bit reaches the bottom of the bore-hole, the catches i snap into the grooves h, as shown-in Fig. 1.

Having thus described my invention, I claim as new;

1. Ina deep-boring reamer, in combina# tion, a rotary working barrel, a boring-head sliding within the same, a crown-bit having two yokes pivoted to the head, and means for coupling the head with the barrel when rotation of the formeris requisite, substantially as described.

2. In a deep-boring reamer, in combination, a rotary working barrel having internal longitudinal grooves, a boring-head sliding within the barrel and external springactuated catches carried by the boring-head and engaging in the said grooves, substantially as escribed.

3. In a deep-boring reamer, in combination, a rotary working barrel, a boring-head slidable thereon, means for coupling the head to rotate with the barrel, and a crown-bit com osed of two yoke-shaped members piv- Ote( to the lower end of the borin -head and resting under the lower end of the ar'rel during lstraight boring, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

MICHAEL BOOF. 

